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U.S. President Donald Trump’s latest trade tariff proposals have some economists questioning whether the president and his team understand economics.

Trump doubled down Friday on his proposal to add a 25% tariff on steel imports and a 10% tariff on aluminum imported to the United States from other countries, a move that prompted a sell-off in U.S. equities and the dollar after it was announced on Thursday.

“This is a clear demonstration that the Trump administration does not understand trade economics,” said Bernard Baumohl, managing director and chief global economist at the Economic Outlook Group, in a phone interview. “These tariffs when they’ve been imposed in the past have done more harm than good. The problem is that politicians have an ahistorical memory that goes back sometimes to breakfast.”

The proposal has generally been panned by economists and market analysts who see this latest endeavor as Trump playing politics rather than boost the economy.

“I think it will be ineffective in the long run,” Thomas Simons, money market economist at Jefferies & Co. told Yahoo Finance. “Trump has a point about having smart trade relationships and not being put in extremely disadvantageous position but this is more of a blunt way of going about it than would be effective.”

Job losses could be much worse than job gains

Economists have also noted that in the United States there are substantially more industries and workers that rely on steel as an input than are actual manufacturers of the metal.

The Institute of International Finance points out that, as with many manufacturing industries, technology has been replacing human jobs in metal production for years. They estimate the steel and aluminum manufacturing sectors only account for about 150,000 jobs. On the other hand, there are nearly 2 million jobs across the country in steel-intensive industries where steel is at least 5% of input requirements, including the auto sector, construction, appliance and machinery manufacturing. Those will see input costs rise.